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Establishment of Pre-Harvest Residue Limit(PHRL) of Insecticide Chlorfenapyr and Fungicide Fenarimol during Cultivation of Chwinamul(Aster scaber)

취나물의 재배기간 중 살충제 Chlorfenapyr와 살균제 Fenarimol의 생산단계 농약잔류허용기준의 설정

  • Lim, Jong-Sung (Department of Agricultural Chemistry, Chungnam National University) ;
  • Hong, Ji-Hyung (Department of Agricultural Chemistry, Chungnam National University) ;
  • Lee, Cho-Rong (Department of Agricultural Chemistry, Chungnam National University) ;
  • Han, Kook-Tak (Chungnam Provincial Office, National Agricultural Products Quality Management Service) ;
  • Lee, Yu-Ri (Chungnam Provincial Office, National Agricultural Products Quality Management Service) ;
  • Lee, Kyu-Seung (Department of Agricultural Chemistry, Chungnam National University)
  • 임종성 (충남대학교 농화학과) ;
  • 홍지형 (충남대학교 농화학과) ;
  • 이초롱 (충남대학교 농화학과) ;
  • 한국탁 (국립농산물품질관리원 충남지원) ;
  • 이유리 (국립농산물품질관리원 충남지원) ;
  • 이규승 (충남대학교 농화학과)
  • Received : 2011.02.23
  • Accepted : 2011.03.20
  • Published : 2011.03.31

Abstract

BACKGROUND: This study was performed to investigate pre-harvest residue limit (PHRL) in Chwinamul, to estimate biological half-life for residue of each pesticide. Chwinamul was sprayed with pesticides of standard and double application rate. Chlorfenapyr and fenarimol were sprayed once on Chwinamul at 10 days before harvest, and it was sampled 7 times and analysed the residual change of two pesticides. METHODS AND RESULTS: Chwinamul sample was extracted with acetonitrile and partitioned with dichloromethane, and pesticide residues were determined with GCECD. Method quantitation limit (MQL) of chlorfenapyr was 0.10 mg/kg and that of fenarimol was 0.02 mg/kg. Recoveries of chlorfenapyr at two fortification levels of 1.0 and 5.0 mg/kg were $94.2{\pm}$1.70 and $99.0{\pm}1.61%$, respectively. Recoveries of fenarimol at two fortification levels of 0.2 and 1.0 mg/kg were $92.1{\pm}2.14$ and $83.1{\pm}1.98%$, respectively. CONCLUSION(s): The biological half-lives of chlorfenapyr were about 3.5 days at standard application rate, and 3.4 days at double application rate. The biological half-lives of fenarimol were about 6.0 days at standard application rate, and 5.9 days at double application rate. The PHRLs of chlorfenapyr were recommended as 13.02 and 6.25 mg/kg for 10 and 5 days before harvest, respectively. And the PHRLs of fenarimol were recommended as 2.80 and 1.67 mg/kg for 10 and 5 days before harvest, respectively.

Keywords

Biological half-lives;Chlorfenapyr;Fenarimol;MRL;Pre-Harvest Residue Limit(PHRL)

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